And the former Hoops hero feels the club will fire a huge message of backing to Brendan Rodgers if they splash out to sign the striker.

Edouard’s future has rocketed up the priority list at Parkhead with the manager stating he wants to make the loan move permanent and the 20-year-old admitting his heart is now set on staying in Glasgow.

Although Rodgers has refused to discuss exact figures it’s understood Paris St Germain will want a healthy fee for the derby hero who has bagged three goals in his last two Premiership games against Rangers.

But Hartson believes there are two massive reasons why the champions should make the move happen.

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Firstly, with plenty of untapped potential still stuffed in Edouard’s locker, the Welshman believes Celtic could make a huge future profit on him, regardless of what he costs.

And, secondly, Hartson reckons finding the funds and going an extra mile if required is just the type of move to convince Rodgers the club will continue to back him every step of the way and ensure he fends off interest in his services.

“If he does very well and bangs in 40 goals next season then his value would suddenly treble, so Celtic would certainly look at that aspect.

“Bargains are sometimes dearer than £2million and Celtic are in a better position to spend now than they were under Ronny Deila when they missed out on the Champions League for two seasons and crowds were down to 25,000. Brendan has brought the crowds back.

“I think there’s a level they’ll be prepared to go to and I’d certainly pay £6m for him.

“I’m sure he’s a player Brendan wants to keep, so would Celtic stretch to £8m on the back of the Champions League revenue from the last two seasons? Are they going to sell Moussa Dembele? That would bring in even more funds.

John Hartson insists a full-time deal for the striker would be invaluable

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“If PSG are being sensible Celtic would match their price but they won’t pay silly money.

“Let’s be realistic about it. They paid £4.5m for Olivier Ntcham and the same for Scott Sinclair. Celtic aren’t going to buy anyone for £15-20m because they don’t have that kind of money. But you’ve now got to back your manager if you want him to continue and take you through the next two or three seasons.

“To keep a man like Brendan, if he says: I really want this player, they might say: This once, I’ll stretch for you.

“If the club show that, they might get that little bit back from Brendan in terms of staying on.

“This is a really great opportunity for Celtic to go: Brendan, we love you here, we want you to stay for the next two or three seasons.

“But you’ve got to be able to back him in the market as well, show him that you’ll support him and you’re behind him.

Hartson has urged Peter Lawwell to back Rodgers generously in the transfer market (Image: SNS Group)

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“People like Edouard who, with a little more improvement, will take you into the Champions League group stages. You need a better quality.

“Celtic have lots of quality players but if you can add one or two every year who have that little bit of extra quality, that’s the key.

“That’s where Brendan wants to go. He’s on the cusp of winning a double treble, he’ll be setting new targets and setting the team new targets.

“He’ll want them to win the treble again and do better in Europe, that’s common sense. If PSG want a lot of money for Edouard, the board are showing Brendan a real intent to keep one of the super-managers, who’s very sought after at the minute.”

PSG could demand in excess of the club record £6m that was paid for Hartson and Chris Sutton almost two decades ago but the Welshman isn’t shocked their tags have stayed the limit figure.